Etymology
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negation (n.)

early 15c., negacioun, "an act of denial," from Old French negacion (12c.) and directly from Latin negationem (nominative negatio) "denial," noun of action from past-participle stem of negare "deny, say no," from PIE root *ne- "not." As "a negative assertion," mid-15c.

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Definitions of negation

negation (n.)
a negative statement; a statement that is a refusal or denial of some other statement;
negation (n.)
the speech act of negating;
negation (n.)
(logic) a proposition that is true if and only if another proposition is false;
From wordnet.princeton.edu